Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual casal tem uma média de 17,2?
 ###Tabelas: CREATE TABLE all-time_liga_acb_table (all-time_liga_acb_table_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Season INT, Played INT, Lost INT, 1 st VARCHAR, 2 nd VARCHAR, 3 rd VARCHAR, 4 th VARCHAR, Debut VARCHAR, Since/Last App VARCHAR, Best INT) CREATE TABLE current_fleet_size (current_fleet_size_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Airline VARCHAR, Country VARCHAR, Fleet size INT, Remarks VARCHAR) CREATE TABLE past_production (past_production_id AUTO_INCREMENT PRIMARY KEY, Headphone Model VARCHAR, Headphone Class VARCHAR, Sensitivity (dB) VARCHAR, Impedance (Ohms) INT, Driver-matched dB VARCHAR, Construction VARCHAR, Earpads VARCHAR, Termination VARCHAR, Succeeded by VARCHAR) CREATE TABLE elimination_chamber_entrances_and_eliminations_smackdown (elimination_chamber_entrances_and_eliminations_smackdown_id AUTO_INCREMENT PRIMARY KEY, Eliminated INT, Wrestler VARCHAR, Entered INT, Eliminated by VARCHAR, Method of elimination VARCHAR, Time VARCHAR) CREATE TABLE average_score_chart (average_score_chart_id AUTO_INCREMENT PRIMARY KEY, Rank by average INT, Place INT, Couple VARCHAR, Total points INT, Number of dances INT, Average VARCHAR)  
SELECT Couple FROM average_score_chart WHERE Average = 17.2